Most transmissions in present day autos use synchromesh to synchronise the speeds in the input and output shafts. Nevertheless, ahead of the fifties, most cars applied non-synchronous transmissions. In basic phrases, two various gears are attached to enter and output shafts and can also be engaged with each other. https://gearbox30852.ttblogs.com/13446489/an-unbiased-view-of-gearbox